CN114963511A - A zero-cold water heater and control method - Google Patents

Abstract

The invention discloses a zero cold water water heater and a control method, comprising a heat exchanger, the water inlet of the heat exchanger is connected with the cold water pipe, and further comprises: a water storage device, the water inlet is communicated with the cold water pipe, and is provided with a water heater for heating water The heating module of the water mixing valve, including two water inlets and one water outlet, the two water inlets are respectively connected with the water outlet of the heat exchanger and the water outlet of the water storage device, and the water outlet of the water mixing valve is connected with the water end; the control unit , obtain the outlet water temperature of the heat exchanger and compare it with the water temperature set by the user, adjust the heat exchange efficiency of the heat exchanger according to the comparison result, and/or adjust the flow ratio of the outlet water of the water storage device and the outlet water of the heat exchanger in the water mixing valve. The invention adds a water storage device with a heating function in the water heater, can realize the zero cold water function of the water heater without installing a return water pipeline, and is suitable for popularization and use.

Description

A zero-cold water heater and control method

technical field

The invention belongs to the technical field of water heaters, and in particular relates to a zero-cold water water heater and a control method.

Background technique

With the rapid development of society and economy, consumers have higher requirements for the quality of life. At present, gas water heaters generally have the problem of cold water when the water is switched on and off, the problem of temperature rise when the water is stopped, and the problem of hot and cold water, especially when the user takes a shower. At the same time, the above problems greatly damage the user experience, and at the same time, the time for waiting for the water temperature to return to normal also causes a waste of water resources.

In order to solve the above problems, the prior art proposes a variety of zero-cold water solutions, the most common of which is to add a return water pipeline in addition to the hot water pipe and the cold water pipe, but this type of solution is only suitable for newly renovated users and reserved return water. Case. If it is used in places with only hot water and cold water pipelines, it is necessary to install an H valve at the water end to realize the return of water. This will cause all water points to use hot water, and long-term use will also increase the pipeline. pressure, resulting in the rupture of the old pipeline, and its scope of application has been greatly limited.

In view of this, the present invention is proposed.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a zero-cold water water heater and a control method. The water heater is provided with a water storage device inside, so that the cold water and the water storage device exist in each pipeline of the water heater. At the same time, the heat exchange efficiency of the heat exchanger and/or the flow ratio of the mixing valve are adjusted in coordination, and the zero cold water function is realized without installing the return pipe or H valve.

In order to solve the above-mentioned technical problems, the basic conception of the technical scheme adopted in the present invention is:

The first object of the present invention is to provide a zero-cold water water heater, including a heat exchanger, the water inlet of the heat exchanger is connected with the cold water pipe, and also includes: a water storage device, the water inlet is communicated with the cold water pipe, and is equipped with a heating device for heating water heating module; water mixing valve, including two water inlets and one water outlet, the two water inlets are respectively connected with the water outlet of the heat exchanger and the water outlet of the water storage device, and the water outlet of the mixing valve is connected with the water end; control The unit obtains the outlet water temperature of the heat exchanger and compares it with the water temperature set by the user, adjusts the heat exchange efficiency of the heat exchanger according to the comparison result, and/or adjusts the flow ratio of the outlet water of the water storage device and the outlet water of the heat exchanger in the water mixing valve.

In the above scheme, the water heater adopts the water storage device located in the water heater to provide temperature compensation for the water outlet of the water heater, so that the overall system can achieve constant temperature water supply without the need for a return water pipeline, avoiding the problem of zero cold water solution. Accepted flaws. Abandoning the design of the return water pipeline also reduces the pipeline burden, and the water supply process of the water storage device located inside the water heater is also simplified, and a stable constant temperature water supply can be achieved without the combination of various switch valve bodies and pipelines. The first end of the water mixing valve is connected with the water outlet of the heat exchanger, and the second end is connected with the water outlet of the water storage device. Out of the water heater and supplied to the water side. At the same time, the water mixing valve can adjust the flow ratio of the first end and the second end according to the electrical signal; the water storage device can provide temperature compensation for the water outlet of the water heater on the one hand, and on the other hand, compared with only the H valve modified The zero cold water system also plays a certain water pressure buffering role, which greatly improves the service life of the old cold and hot water pipelines connected to it.

A further solution of the zero-cold water heater provided by the present invention is as follows: a first temperature sensor is provided on the water outlet pipeline of the heat exchanger, the first temperature sensor detects the outlet water temperature of the heat exchanger, and the water heater is set according to the outlet water temperature of the heat exchanger and user settings. The difference of the fixed water temperature adjusts the heat exchange efficiency of the heat exchanger, and/or adjusts the flow ratio of the water mixing valve; preferably, the first temperature sensor is set close to the water mixing valve, and obtains the effluent water from the heat exchanger and sends it to the water mixing valve time water temperature.

In the above solution, the first temperature sensor transmits the detected temperature back to the control unit of the water heater, and the water heater compares and calculates the real-time outlet water temperature with the water temperature set by the user, and adjusts the power and/or water mixing valve of the heat exchanger accordingly. flow distribution. Since there is a certain distance between the water outlet pipeline of the heat exchanger and the water mixing valve, in order to prevent the influence of the temperature of the stored water in this section of the pipeline on the outlet water temperature, the present invention preferably sets the first temperature sensor on the side close to the water mixing valve, This makes the real-time acquisition of the outlet water temperature of the heat exchanger more accurate.

A further solution of the zero-cold water heater provided by the present invention is that: the water outlet of the mixing valve is provided with a second temperature sensor, the second temperature sensor detects the temperature of the confluence of the heat exchanger and the water storage device, and the water heater is based on the confluence. The difference between the outlet water temperature and the user-set water temperature can be selected to continue to adjust the heat exchange efficiency of the heat exchanger and/or the flow ratio of the mixing valve, or to end the adjustment.

In the above solution, the water outlet of the mixing valve is relatively close to the water end, the second temperature sensor located at the water outlet of the mixing valve can obtain the temperature of the confluent water in time, and the second temperature sensor sends the information to the control unit, and the control unit judges. Whether the water temperature meets the water requirements and decides whether to continue to adjust the various parts of the water heater.

A further solution of the zero-cold water heater provided by the present invention is that the temperature of the stored water in the water storage device is always higher than the water temperature set by the user.

In the above scheme, always keep the storage water temperature at a high level (close to or slightly higher than the user-set water temperature), so that the water temperature of the heat exchanger and the water storage device that are merged through the mixing valve can meet the user's requirements and can be realized at any time. Compensation for water temperature at the water end. In the event of a problem with the water supply of the water heater or other failures, the connecting pipe between the heat exchanger and the water storage device is closed.

In the above solution, limited by the space occupied by the water heater, the water storage device provided inside the water heater generally has a smaller volume than a similar water storage device externally placed upstream of the water end. Although the water body in the water storage device can be pre-heated, when the temperature is low in winter, when the water heater is turned on for the first time, the low-temperature water in the pipeline from the water outlet of the heat exchanger to the first end of the mixing valve will mix with the outlet water of the heat exchanger. The temperature of the water inside is greatly lowered, so that the outlet water temperature of the heat exchanger detected by the first temperature sensor does not meet the requirements for use. In order to solve the above problems, the present invention further adjusts the efficiency of the heat exchanger. When the outlet water temperature of the heat exchanger collected by the first temperature sensor is significantly lower than the water temperature set by the user, the heat exchange efficiency of the heat exchanger is improved in a short time. , so that the low-temperature water remaining in the pipeline is heated to a certain extent and then supplied to the mixing valve. The improvement of the heat exchange efficiency can be temporarily realized by increasing the power of the burner, so that the outlet water temperature of the heat exchanger is higher than the set water temperature in a short time, so as to neutralize the low temperature water in the pipeline.

The second object of the present invention is to provide a control method for the zero-cold water heater as described above. Or the flow ratio of the mixing valve, so that the water body at the water supply end conforms to the water temperature set by the user.

According to the above control method, when the outlet water temperature of the heat exchanger is lower than the water temperature set by the user, calculate the difference between the outlet water temperature of the heat exchanger and the water temperature set by the user, and select and adjust the exchange rate of the heat exchanger according to the numerical range of the difference. Thermal efficiency and/or adjust the flow ratio of the mixing valve.

In the above scheme, the comparison result of the water temperature at the outlet of the heat exchanger and the water temperature set by the user can be judged by multi-step logic according to the positive, negative or absolute value of the difference between the two, and the positive and negative judgment of the difference can determine the heat exchange. The relationship between the outlet water temperature of the device and the water temperature set by the user, further, according to the numerical value of the difference, the water temperature can be further adjusted accurately by a single scheme or a combination of multiple schemes.

According to the above control method, when the outlet water temperature of the heat exchanger is lower than the water temperature set by the user and the difference is lower than the set value, the flow ratio of the outlet water of the water storage device in the mixing valve is increased; when the outlet water temperature of the heat exchanger is When the temperature is lower than the water temperature set by the user and the difference is not lower than the set value, the heat exchange efficiency of the heat exchanger is improved, and the flow rate of the water storage device in the water mixing valve is increased at the same time.

In the above solution, due to the different use environments and application occasions, the difference between the outlet water temperature of the heat exchanger and the water temperature set by the user is not fixed. When the difference is small, for example, lower than the set value. A single adjustment method can be used to realize the temperature compensation of the water outlet from the water heater. However, when the difference is large, it is necessary to adopt a combination of various technical means to realize temperature compensation. The set value is a preset value in the control unit, and can also be adjusted by users or maintenance personnel according to experience or user manuals. In addition, the heating module can be controlled to always keep the water temperature in the water storage device higher than the water temperature set by the user, and can solve the problem that the temperature of the water storage water drops too quickly due to the low ambient temperature.

According to the above control method, when the outlet water temperature of the heat exchanger is not less than the water temperature set by the user, the outlet water flow rate of the water storage device is turned off.

In the above scheme, since the outlet water temperature of the heat exchanger has reached the water temperature set by the user, the hot water in the water storage device does not need to provide temperature compensation at this time. Cut off the water flow of the water storage device.

According to the above control method, it specifically includes the following steps:

S1. Determine whether the outlet water temperature T ₀ of the heat exchanger is lower than the user-set water temperature T _s , if so, go to step S2; otherwise, go to step S4;

S2. Increase the flow ratio of the water outlet of the water storage device in the mixing valve and/or improve the heat exchange efficiency of the heat exchanger, and then perform step S3;

S3. Determine whether the confluence water temperature T _t of the water heater and the water storage device is equal to the water temperature set by the user, if so, go to step S5, otherwise return to step S2;

S4. Turn off the water outlet flow of the water storage device, and then perform step S5;

S5. The adjustment ends.

According to the above control method, the step S1' is further included between the steps S1 and S2, and the step S2 is composed of the steps S21 and S22, as follows:

S1'. Obtain the difference value T _s between the outlet water temperature T ₀ of the heat exchanger and the water temperature set by the user, and determine whether the difference value is lower than the set value S, if so, go to step S21, if not, go to step S22;

S21. Increase the flow rate of the water outlet of the water storage device in the mixing valve, and then perform step S3;

S22. Improve the heat exchange efficiency of the heat exchanger, and at the same time increase the flow rate ratio of the water outlet of the water storage device in the water mixing valve, and then perform step S3.

After adopting the above-mentioned technical scheme, the present invention has the following beneficial effects compared with the prior art:

1. The zero cold water water heater provided by the present invention adopts the water storage device located in the water heater to provide temperature compensation for the water outlet of the water heater, and can realize constant temperature water supply without setting up a return water pipeline, avoiding that the zero cold water solution is not easy to be used due to problems such as pipeline renovation. defects accepted by the user;

2. In the zero cold water water heater provided by the present invention, on the one hand, the water storage device can provide temperature compensation for the water outlet of the water heater, and on the other hand, compared with the zero cold water system modified only by the H valve, it also plays a certain water pressure buffering effect. , greatly improving the service life of the old cold and hot water pipelines connected to it;

3. In the zero-cold water water heater provided by the present invention, the cold water provided by the water supply pipe is used as the water source in the water storage device, which is heated and merged with the water outlet of the water heater to ensure the constant water temperature at the water end in various ways; and other problems such as failure of the water heater When the water is stored, the hot water in the water storage device can be temporarily supplied to the water terminal to play an emergency role;

4. In the zero-cold water heater control method provided by the present invention, multi-step logical judgment can be performed according to the positive, negative or numerical value of the difference between the water temperature of the heat exchanger and the water temperature set by the user, so as to realize the accurate compensation of the water temperature of the heat exchanger. ;

5. In the water heater control method provided by the present invention, according to the water temperature from the outlet of the heat exchanger to the first end of the water mixing valve, the heat exchange efficiency of the heat exchanger is improved in a short time, so that the low-temperature water retained in the pipeline is subject to a certain amount of heat. After the water is heated to a certain degree, it is supplied to the water storage device; the adverse effect of the low temperature water in the pipeline on the temperature of the hot water in the water storage device is avoided.

The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Description of drawings

The accompanying drawings, as a part of the present invention, are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings in the following description are only some embodiments, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort. In the attached image:

Fig. 1 is the structural representation of the zero cold water water heater of the present invention;

Fig. 2 is the logic flow chart of the control method in Embodiment 2 of the present invention;

Fig. 3 is the logic flow chart of the control method in Embodiment 3 of the present invention;

In the figure: 1—water heater, 2—water storage device, 3—water mixing valve, 31—first end of water mixing valve, 32—second end of water mixing valve, 33—third end of water mixing valve, 4—heat exchange device, 5—water end, 6—cold water pipe.

It should be noted that these drawings and written descriptions are not intended to limit the scope of the present invention in any way, but to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used to illustrate the present invention , but are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limiting the invention.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

As shown in FIG. 1 to FIG. 3 , the present invention provides a zero-cold water water heater and a control method, wherein a water storage device is added inside the water heater, so that the cold water stored in each pipeline of the water heater and the hot water in the water storage device are separated from each other. At the same time, the heat exchange efficiency of the heat exchanger and/or the flow ratio of the mixing valve are adjusted in coordination, and the zero-cold water function is realized without installing the return pipe or H valve. In the control method, the water heater obtains the outlet water temperature of the heat exchanger and compares it with the water temperature set by the user, and judges whether it is necessary to perform temperature compensation for the water temperature at the water end according to the comparison result, and the temperature compensation includes adjusting the power of the heat exchanger and/or The flow ratio of the mixing valve.

Example 1

In this embodiment, as shown in FIG. 1 , a zero-cold water water heater is provided, which includes a heat exchanger 4, the water inlet of the heat exchanger 4 is connected to the cold water pipe 6, and also includes: a water storage device 2, a water inlet It is connected with the cold water pipe 6 and is provided with a heating module for heating water; the water mixing valve 3 includes two water inlets and one water outlet, and the two water inlets are respectively connected with the water outlet of the heat exchanger 4 and the water outlet of the water storage device 2. , the water outlet of the water mixing valve 3 is connected to the water end 5; the control unit obtains the outlet water temperature of the heat exchanger 4 and compares it with the water temperature set by the user, adjusts the heat exchange efficiency of the heat exchanger 4 according to the comparison result, and/or adjusts the storage The flow ratio of the water outlet of the water device 2 and the outlet water of the heat exchanger 4 in the water mixing valve 3.

In this embodiment, the water heater adopts the water storage device located in the water heater to provide temperature compensation for the water outlet of the water heater, so that the overall system can achieve constant temperature water supply without the need for a return water pipeline, avoiding the problem of zero cold water solution due to pipeline renovation and other problems. User Accepted Defects. Abandoning the design of the return water pipeline also reduces the pipeline burden, and the water supply process of the water storage device located inside the water heater is also simplified, and a stable constant temperature water supply can be achieved without the combination of various switch valve bodies and pipelines. The first end 31 of the water mixing valve 3 is connected to the water outlet of the heat exchanger 4, and the second end 32 is connected to the water outlet of the water storage device 2. The water outlet of the water storage device 2 and the hot water passing through the heat exchanger 4 are in the Its internal confluence flows out of the water heater 1 from the third end 33 and is supplied to the water end 5 . At the same time, the water mixing valve 3 can adjust the flow ratio of the first end 31 and the second end 32 according to the electrical signal; the water storage device 2 can provide temperature compensation for the water outlet of the water heater 4 on the one hand, and on the other hand, Compared with the zero-cold water system modified only by the H valve, it also plays a certain role in buffering the water pressure, greatly improving the service life of the old cold and hot water pipelines connected to it.

In this embodiment, a first temperature sensor is provided on the water outlet pipeline of the heat exchanger 4, the first temperature sensor detects the water outlet temperature of the heat exchanger 4, and the water heater is based on the difference between the outlet water temperature of the heat exchanger and the water temperature set by the user. Adjust the heat exchange efficiency of the heat exchanger 4, and/or adjust the flow ratio of the water mixing valve 3; preferably, the first temperature sensor is set close to the water mixing valve 3, and obtains when the water from the heat exchanger 4 is transported to the water mixing valve. water temperature.

In this embodiment, the first temperature sensor transmits the detected temperature back to the control unit of the water heater, and the water heater compares and calculates the real-time outlet water temperature with the water temperature set by the user, and adjusts the power and/or water mixing of the heat exchanger accordingly. Valve flow distribution. Since there is a certain distance between the water outlet pipeline of the heat exchanger and the water mixing valve, in order to prevent the influence of the temperature of the stored water in this section of the pipeline on the outlet water temperature, the present invention preferably sets the first temperature sensor on the side close to the water mixing valve, This makes the real-time acquisition of the outlet water temperature of the heat exchanger more accurate.

In this embodiment, the water outlet of the water mixing valve 3 is provided with a second temperature sensor, the second temperature sensor detects the temperature of the confluent water from the heat exchanger 4 and the water storage device 2, and the water heater communicates with the user according to the temperature of the confluent water. Set the difference of water temperature and choose to continue to adjust the heat exchange efficiency of the heat exchanger and/or the flow ratio of the mixing valve, or choose to end the adjustment.

In this embodiment, the water outlet of the water mixing valve is relatively close to the water end, and the second temperature sensor located at the water outlet of the water mixing valve can obtain the temperature of the confluent water in time, and the second temperature sensor sends the information to the control unit, and the control unit Determine whether the water temperature meets the water requirements and decide whether to continue to adjust the various parts of the water heater.

In this embodiment, the water temperature of the water storage in the water storage device is always higher than the water temperature set by the user.

In this embodiment, the storage water temperature is always kept at a high level (close to or slightly higher than the water temperature set by the user), so that the water temperature of the heat exchanger and the water storage device that are confluenced by the mixing valve can meet the user's requirements. Compensation for the water temperature at the water end is realized. In the event of a problem with the water supply of the water heater or other failures, the connecting pipe between the heat exchanger and the water storage device is closed.

In this embodiment, limited by the space occupied by the water heater, the water storage device provided inside the water heater generally has a smaller volume than a similar water storage device externally placed upstream of the water end. Although the water body in the water storage device can be pre-heated, when the temperature is low in winter, when the water heater is turned on for the first time, the low-temperature water in the pipeline from the water outlet of the heat exchanger to the first end of the mixing valve will mix with the outlet water of the heat exchanger. The temperature of the water inside is greatly lowered, so that the outlet water temperature of the heat exchanger detected by the first temperature sensor does not meet the requirements for use. In order to solve the above problems, the present invention further adjusts the efficiency of the heat exchanger. When the outlet water temperature of the heat exchanger collected by the first temperature sensor is significantly lower than the water temperature set by the user, the heat exchange efficiency of the heat exchanger is improved in a short time. , so that the low-temperature water remaining in the pipeline is heated to a certain extent and then supplied to the mixing valve. The improvement of the heat exchange efficiency can be temporarily realized by increasing the power of the burner, so that the outlet water temperature of the heat exchanger is higher than the set water temperature in a short time, so as to neutralize the low temperature water in the pipeline.

Example 2

In this embodiment, as shown in FIG. 2 , a method for controlling a zero-cold water water heater as described in Embodiment 1 is provided. The water heater determines whether it is necessary to adjust the heat exchange according to the difference between the outlet water temperature of the heat exchanger and the water temperature set by the user. The heat exchange efficiency of the heater and/or the flow ratio of the water mixing valve are adjusted so that the water body at the water supply end conforms to the water temperature set by the user.

According to the above control method, when the outlet water temperature of the heat exchanger is not less than the water temperature set by the user, the outlet water flow rate of the water storage device is turned off.

In the above solution, since the outlet water temperature of the heat exchanger has reached the water temperature set by the user, the hot water in the water storage device does not need to provide temperature compensation at this time, and the outlet water flow of the water storage device can be reduced by adjusting the mixing valve to maintain the outlet water. Slightly higher than the water temperature set by the user, or directly shut off the water flow of the water storage device.

In this embodiment, the comparison result between the outlet water temperature of the heat exchanger and the water temperature set by the user can be determined by multi-step logic according to the positive, negative or absolute value of the difference between the two. The relationship between the outlet water temperature of the heater and the water temperature set by the user is used as the criterion for adjusting the water temperature.

Specifically, the following steps are included:

S1. Determine whether the outlet water temperature T ₀ of the heat exchanger is lower than the user-set water temperature T _s , if so, go to step S2; otherwise, go to step S4;

S2. Increase the flow ratio of the water outlet of the water storage device in the mixing valve and/or improve the heat exchange efficiency of the heat exchanger, and then perform step S3;

S3. Determine whether the confluence water temperature T _t of the water heater and the water storage device is equal to the water temperature set by the user, if so, go to step S5, otherwise return to step S2;

S4. Turn off the water outlet flow of the water storage device, and then perform step S5;

S5. The adjustment ends.

Example 3

In this embodiment, as shown in Figure 3, it is a further scheme based on Embodiment 2, as follows:

In this embodiment, when the outlet water temperature of the heat exchanger is lower than the water temperature set by the user and the difference is lower than the set value, the flow ratio of the outlet water of the water storage device in the mixing valve is increased; when the outlet water temperature of the heat exchanger is When the temperature is lower than the water temperature set by the user and the difference is not lower than the set value, the heat exchange efficiency of the heat exchanger is improved, and the flow rate of the water storage device in the water mixing valve is increased at the same time.

In this embodiment, the comparison result between the outlet water temperature of the heat exchanger and the water temperature set by the user can be determined by multi-step logic according to the positive, negative or absolute value of the difference between the two. The water temperature can be precisely adjusted for a single scheme or a combination of multiple schemes.

In this embodiment, when the outlet water temperature of the heat exchanger is lower than the water temperature set by the user and the difference is lower than the set value, the flow ratio of the outlet water of the water storage device in the mixing valve is increased; when the outlet water temperature of the heat exchanger is When the temperature is lower than the water temperature set by the user and the difference is not lower than the set value, the heat exchange efficiency of the heat exchanger is improved, and the flow rate of the water storage device in the water mixing valve is increased at the same time.

In this embodiment, due to different use environments and application occasions, the difference between the outlet water temperature of the heat exchanger and the water temperature set by the user is not fixed. When the difference is small, for example, lower than the set water temperature When the value is set, a single adjustment method can be used to realize the temperature compensation of the water outlet from the water heater. However, when the difference is large, it is necessary to adopt a combination of various technical means to realize temperature compensation. The set value is a preset value in the control unit, and can also be adjusted by users or maintenance personnel according to experience or user manuals. In addition, the heating module can be controlled to always keep the water temperature in the water storage device higher than the water temperature set by the user, and can solve the problem that the temperature of the water storage water drops too quickly due to the low ambient temperature.

The difference between this embodiment and Embodiment 2 is that step S1' is also included between the steps S1 and S2, and the step S2 is composed of steps S21 and S22, as follows:

S1'. Obtain the difference value T _s between the outlet water temperature T ₀ of the heat exchanger and the water temperature set by the user, and determine whether the difference value is lower than the set value S, if so, go to step S21, if not, go to step S22;

S21. Increase the flow rate of the water outlet of the water storage device in the mixing valve, and then perform step S3;

S22. Improve the heat exchange efficiency of the heat exchanger, and at the same time increase the flow rate ratio of the water outlet of the water storage device in the water mixing valve, and then perform step S3.

In this embodiment, when the judgment in step S3 is no, return to step S1', and other implementations of this embodiment are the same as those in Embodiment 2.

In the above-described embodiments, any process or method descriptions in the flowcharts or otherwise described herein may be understood to represent code comprising one or more executable instructions for implementing a particular logical function or step of the process. modules, segments or portions, and the scope of the preferred embodiments of the invention includes alternative implementations, which may be performed out of the order shown or discussed, including in a substantially simultaneous manner or in the reverse order depending on the functionality involved perform functions, which should be understood by those skilled in the art to which embodiments of the present invention pertain.

The logic and/or steps represented in flowcharts or otherwise described herein, for example, may be considered an ordered listing of executable instructions for implementing the logical functions, may be embodied in any computer-readable medium, For use with, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other system that can fetch instructions from and execute instructions from an instruction execution system, apparatus, or apparatus) or equipment. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport the program for use by or in connection with an instruction execution system, apparatus, or apparatus. More specific examples (non-exhaustive list) of computer readable media include the following: electrical connections with one or more wiring (electronic devices), portable computer disk cartridges (magnetic devices), random access memory (RAM), Read Only Memory (ROM), Erasable Editable Read Only Memory (EPROM or Flash Memory), Fiber Optic Devices, and Portable Compact Disc Read Only Memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program may be printed, as the paper or other medium may be optically scanned, for example, followed by editing, interpretation, or other suitable medium as necessary process to obtain the program electronically and then store it in computer memory.

It should be understood that various parts of the present invention may be implemented in hardware, software, firmware or a combination thereof. In the above-described embodiments, various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or a combination of the following techniques known in the art: Discrete logic circuits, application specific integrated circuits with suitable combinational logic gates, Programmable Gate Arrays (PGA), Field Programmable Gate Arrays (FPGA), etc.

Those skilled in the art can understand that all or part of the steps carried by the methods of the above embodiments can be completed by instructing the relevant hardware through a program, and the program can be stored in a computer-readable storage medium, and the program can be stored in a computer-readable storage medium. When executed, one or a combination of the steps of the method embodiment is included.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing module, or each unit may exist physically alone, or two or more units may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. If the integrated modules are implemented in the form of software functional modules and sold or used as independent products, they may also be stored in a computer-readable storage medium. The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, and the like.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Within the scope of the technical solution of the present invention, personnel can make some changes or modifications to equivalent examples of equivalent changes by using the above-mentioned technical content, but any content that does not depart from the technical solution of the present invention is based on the technical solution of the present invention. Substantially any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the solutions of the present invention.

Claims (10)

1. a zero cold water water heater, comprising a heat exchanger, the water inlet of the heat exchanger is connected with a cold water pipe, it is characterized in that, also comprises: A water storage device, the water inlet is connected with the cold water pipe, and a heating module for heating water is provided; The water mixing valve includes two water inlets and one water outlet, the two water inlets are respectively connected with the water outlet of the heat exchanger and the water outlet of the water storage device, and the water outlet of the water mixing valve is connected with the water end; The control unit obtains the outlet water temperature of the heat exchanger and compares it with the water temperature set by the user, adjusts the heat exchange efficiency of the heat exchanger according to the comparison result, and/or adjusts the flow ratio of the outlet water of the water storage device and the outlet water of the heat exchanger in the water mixing valve. 2. The zero-cold water water heater according to claim 1, characterized in that, a first temperature sensor is provided on the water outlet pipeline of the heat exchanger, the first temperature sensor detects the temperature of the water outlet of the heat exchanger, and the water heater according to the water outlet of the heat exchanger is provided with a first temperature sensor. The difference between the temperature and the water temperature set by the user adjusts the heat exchange efficiency of the heat exchanger, and/or adjusts the flow ratio of the water mixing valve; Preferably, the first temperature sensor is arranged close to the water mixing valve to obtain the water temperature when the effluent water from the heat exchanger is transported to the water mixing valve. 3. The zero-cold water water heater according to claim 1, wherein the water outlet of the water mixing valve is provided with a second temperature sensor, and the second temperature sensor detects the temperature of the confluence of the water storage device and the heat exchanger, and the water heater Select to continue to adjust the heat exchange efficiency of the heat exchanger and/or the flow ratio of the mixing valve according to the difference between the temperature of the confluent water and the water temperature set by the user, or to end the adjustment. 4 . The zero-cold water heater according to claim 1 , wherein the temperature of the stored water in the water storage device is always higher than the water temperature set by the user. 5 . 5. A control method for a zero-cold water heater according to any one of claims 1 to 4, wherein the heater determines whether it is necessary to adjust the temperature of the heat exchanger according to the difference between the outlet water temperature of the heat exchanger and the water temperature set by the user. The heat exchange efficiency and/or the flow ratio of the water mixing valve, so that the water body at the water supply end meets the user-set water temperature. 6. The control method of the zero-cold water heater according to claim 5, wherein when the outlet water temperature of the heat exchanger is lower than the water temperature set by the user, the difference between the outlet water temperature of the heat exchanger and the water temperature set by the user is calculated, and according to The value range in which the difference is located is selected to adjust the heat exchange efficiency of the heat exchanger and/or adjust the flow ratio of the water mixing valve. 7. The control method of the zero-cold water heater according to claim 6, characterized in that, when the outlet water temperature of the heat exchanger is lower than the water temperature set by the user and the difference is lower than the set value, the storage capacity in the mixing valve is increased. The flow ratio of the water outlet of the water device; when the outlet water temperature of the heat exchanger is lower than the water temperature set by the user and the difference is not lower than the set value, the heat exchange efficiency of the heat exchanger is improved, and the water storage in the water mixing valve is increased at the same time. The flow rate of the water from the device. 8 . The control method of the zero-cold water heater according to claim 5 , wherein when the outlet water temperature of the heat exchanger is not less than the water temperature set by the user, the outlet water flow rate of the water storage device is turned off. 9 . 9. The control method of the zero-cold water heater according to any one of claims 5-8, characterized in that, comprising the steps of: S1. Determine whether the outlet water temperature T ₀ of the heat exchanger is lower than the user-set water temperature T _s , if so, go to step S2; otherwise, go to step S4; S2. Increase the flow ratio of the water outlet of the water storage device in the water mixing valve and/or improve the heat exchange efficiency of the heat exchanger, and then perform step S3; S3. Determine whether the confluence water temperature T _t of the water heater and the water storage device is equal to the water temperature set by the user, if so, go to step S5, otherwise return to step S2; S4. Turn off the water outlet flow of the water storage device, and then perform step S5; S5. The adjustment ends. 10. The control method of the zero-cold water heater according to claim 9, wherein a step S1' is further included between the steps S1 and S2, and the step S2 is composed of steps S21 and S22, as follows: S1'. Obtain the difference value T _s between the outlet water temperature T ₀ of the heat exchanger and the water temperature set by the user, and determine whether the difference value is lower than the set value S, if so, go to step S21, if not, go to step S22; S21. Increase the flow rate of the water outlet from the water storage device in the mixing valve, and then perform step S3; S22. Improve the heat exchange efficiency of the heat exchanger, and at the same time increase the flow rate ratio of the water outlet of the water storage device in the water mixing valve, and then perform step S3.

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